package chapter04.example18_19;
class Animal {
    void shout(){
        System.out.println("动物叫");
    }
    public String toString(){
        return "我是一个动物类";
    }
}

public class example18 {
    public static void main(String[] args) {
        Animal animal = new Animal();
        System.out.println(animal.toString());
    }
}
